{"id":"UBUNTU-CVE-2026-110257","details":"OW2 ASM 5.0 before 9.11 contains an excessive memory allocation vulnerability in ClassReader.readBootstrapMethodsAttribute() that sizes an int array from num_bootstrap_methods without validating attribute_length. Attackers can supply a crafted class file of about 100 bytes that forces roughly 2 GB allocation, causing an OutOfMemoryError that crashes the JVM or consuming thread.","modified":"2026-10-17T12:59:51.311121798Z","published":"2026-10-15T00:00:00Z","upstream":["CVE-2026-110257"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-110257"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-110257"},{"type":"REPORT","url":"https://asm.ow2.io/versions.html"},{"type":"REPORT","url":"https://gitlab.ow2.org/asm/asm/-/blob/ASM_9_10_1/asm/src/main/java/org/objectweb/asm/ClassReader.java#L3497"},{"type":"REPORT","url":"https://gitlab.ow2.org/asm/asm/-/commit/eb5fa95bb0670eaec2ecf9b8a3a501b48e5a967c"},{"type":"REPORT","url":"https://gitlab.ow2.org/asm/asm/-/merge_requests/456"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/ow2-asm-5.0-before-9.11-excessive-memory-allocation-via-bootstrapmethods-attribute"}],"affected":[{"package":{"name":"asm","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/asm?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.0~alpha-1","6.0~alpha-2","6.0-1","7.0-1~18.04"],"ecosystem_specific":{"binaries":[{"binary_name":"libasm-java","binary_version":"7.0-1~18.04"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110257.json"}},{"package":{"name":"asm","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/asm?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.1-2","7.2-1"],"ecosystem_specific":{"binaries":[{"binary_version":"7.2-1","binary_name":"libasm-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110257.json"}},{"package":{"name":"asm","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/asm?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.1-1","9.2-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libasm-java","binary_version":"9.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110257.json"}},{"package":{"name":"asm","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/asm?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.4-1","9.5-1","9.6~us1-0ubuntu1","9.7-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libasm-java","binary_version":"9.7-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110257.json"}},{"package":{"name":"asm","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/asm?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.9.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libasm-java","binary_version":"9.9.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110257.json"}},{"package":{"name":"asm","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/asm?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.8-1","9.8-2","9.9.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libasm-java","binary_version":"9.9.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110257.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}